1 // posix.cc -- Helper functions for POSIX-flavored OSs.
3 /* Copyright (C) 2000, 2001, 2002, 2006 Free Software Foundation
5 This file is part of libgcj.
7 This software is copyrighted work licensed under the terms of the
8 Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
25 #include <java-stack.h>
26 #include <java/lang/Thread.h>
27 #include <java/io/InterruptedIOException.h>
28 #include <java/util/Properties.h>
31 extern "C" unsigned long long _clock (void);
34 #if defined(HAVE_PROC_SELF_EXE)
35 static char exec_name[20];
36 // initialized in _Jv_platform_initialize()
39 const char *_Jv_ThisExecutable (void)
41 #if defined(DISABLE_MAIN_ARGS)
42 return "[Embedded App]";
43 #elif defined(HAVE_PROC_SELF_EXE)
45 // initialized in _Jv_platform_initialize()
47 return _Jv_GetSafeArg (0);
51 // gettimeofday implementation.
53 _Jv_platform_gettimeofday ()
55 #if defined (HAVE_GETTIMEOFDAY)
57 gettimeofday (&tv, NULL);
58 return (tv.tv_sec * 1000LL) + (tv.tv_usec / 1000LL);
59 #elif defined (HAVE_TIME)
60 return time (NULL) * 1000LL;
61 #elif defined (HAVE_FTIME)
64 return (t.time * 1000LL) + t.millitm;
69 // In the absence of any function, time remains forever fixed.
75 _Jv_platform_nanotime ()
77 #ifdef HAVE_CLOCK_GETTIME
80 #ifdef CLOCK_MONOTONIC
82 #elif defined (CLOCK_HIGHRES)
87 if (clock_gettime (id, &now) == 0)
89 jlong result = (jlong) now.tv_sec;
90 result = result * 1000000000LL + now.tv_nsec;
93 // clock_gettime failed, but we can fall through.
94 #endif // HAVE_CLOCK_GETTIME
95 #if defined (HAVE_GETTIMEOFDAY)
98 gettimeofday (&tv, NULL);
99 return (tv.tv_sec * 1000000000LL) + tv.tv_usec * 1000LL;
102 return _Jv_platform_gettimeofday () * 1000000LL;
106 // Platform-specific VM initialization.
108 _Jv_platform_initialize (void)
110 #if defined (HAVE_SIGACTION)
111 // We only want this on POSIX systems.
112 struct sigaction act;
113 act.sa_handler = SIG_IGN;
114 sigemptyset (&act.sa_mask);
116 sigaction (SIGPIPE, &act, NULL);
118 signal (SIGPIPE, SIG_IGN);
121 #if defined (HAVE_PROC_SELF_EXE)
122 // Compute our executable name
123 sprintf (exec_name, "/proc/%d/exe", getpid ());
127 // Set platform-specific System properties.
129 _Jv_platform_initProperties (java::util::Properties* newprops)
131 // A convenience define.
132 #define SET(Prop,Val) \
133 newprops->put(JvNewStringLatin1 (Prop), JvNewStringLatin1 (Val))
135 SET ("file.separator", "/");
136 SET ("path.separator", ":");
137 SET ("line.separator", "\n");
138 const char *tmpdir = ::getenv("TMPDIR");
141 SET ("java.io.tmpdir", tmpdir);
145 internal_gettimeofday (struct timeval *result)
147 #if defined (HAVE_GETTIMEOFDAY)
148 gettimeofday (result, NULL);
150 jlong val = _Jv_platform_gettimeofday ();
151 result->tv_sec = val / 1000;
152 result->tv_usec = (val % 1000) * 1000;
153 #endif /* HAVE_GETTIMEOFDAY */
156 // A wrapper for select() which ignores EINTR.
158 _Jv_select (int n, fd_set *readfds, fd_set *writefds,
159 fd_set *exceptfds, struct timeval *timeout)
162 // If we have a timeout, compute the absolute ending time.
163 struct timeval end, delay;
166 internal_gettimeofday (&end);
167 end.tv_usec += timeout->tv_usec;
168 if (end.tv_usec >= 1000000)
171 end.tv_usec -= 1000000;
173 end.tv_sec += timeout->tv_sec;
179 delay.tv_sec = delay.tv_usec = 0;
184 int r = select (n, readfds, writefds, exceptfds,
185 timeout ? &delay : NULL);
186 if (r != -1 || errno != EINTR)
189 // Here we know we got EINTR.
190 if (java::lang::Thread::interrupted ())
191 throw new java::io::InterruptedIOException (JvNewStringLatin1 ("select interrupted"));
193 struct timeval after;
196 internal_gettimeofday (&after);
197 // Now compute new timeout argument.
198 delay.tv_usec = end.tv_usec - after.tv_usec;
199 delay.tv_sec = end.tv_sec - after.tv_sec;
200 if (delay.tv_usec < 0)
203 delay.tv_usec += 1000000;
205 if (delay.tv_sec < 0)
207 // We assume that the user wants a valid select() call
208 // more than precise timing. So if we get a series of
209 // EINTR we just keep trying with delay 0 until we get a
215 #else /* HAVE_SELECT */
220 // Given an address, find the object that defines it and the nearest
221 // defined symbol to that address. Returns 0 if no object defines this
224 _Jv_platform_dladdr (void *addr, _Jv_AddrInfo *info)
228 #if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
230 ret_val = dladdr (addr, &addr_info);
233 info->file_name = addr_info.dli_fname;
234 info->base = addr_info.dli_fbase;
235 info->sym_name = addr_info.dli_sname;
236 info->sym_addr = addr_info.dli_saddr;
239 info->file_name = NULL;
241 info->sym_name = NULL;
242 info->sym_addr = NULL;